However, the multiple scopes issue is unfortunate, see also Ehsan's
message to blink-dev in October:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/QfxPGw0kJW8/Xm67_ftW3jgJ
The thread quickly died, and AFAICT the risk of shipping incompatible
implementations remains. The GitHub issue has seen recent activity,
but prioritizing its resolution would be helpful.